package com.lai.gulimall.elasticsearch.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.lai.common.to.SkuEsModel;
import com.lai.common.utils.R;
import com.lai.gulimall.elasticsearch.config.GulimallElasticSearchConfig;
import com.lai.gulimall.elasticsearch.constant.EsConstant;
import com.lai.gulimall.elasticsearch.feign.ProductFeignService;
import com.lai.gulimall.elasticsearch.service.MallSearchService;
import com.lai.gulimall.elasticsearch.vo.AttrResponseVo;
import com.lai.gulimall.elasticsearch.vo.BrandVo;
import com.lai.gulimall.elasticsearch.vo.SearchParam;
import com.lai.gulimall.elasticsearch.vo.SearchResult;
import lombok.extern.slf4j.Slf4j;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Slf4j
@Service
public class MallSearchServiceImpl implements MallSearchService {


    @Qualifier("esRestClient")
    @Autowired
    private RestHighLevelClient client;

    @Autowired
    ProductFeignService productFeignService;


    @Override
    public SearchResult search(SearchParam param) {

        SearchResult result = null;

        //动态构建出查询需要的DSL语句
        //1、准备检索请求
        SearchRequest searchRequest = buildSearchRequest(param);
        try {
            //2、执行检索请求
            SearchResponse search = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);
            //3、分析响应数据封装成我们需要的格式
            result = buildSearchResult(search, param);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }


    /**
     * 分析响应数据封装成我们需要的格式
     *
     * @param response 从es中查询到的数据
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response, SearchParam param) {
        SearchResult result = new SearchResult();
        //1、返回所得查询到的商品信息
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModelList = new ArrayList<>();
        if (hits.getHits() != null && hits.getHits().length > 0) {
            for (SearchHit hit : hits.getHits()) {
                String source = hit.getSourceAsString();
                SkuEsModel skuEsModel = JSON.parseObject(source, SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())) {
                    //设置高亮
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String title = skuTitle.getFragments()[0].string();
                    skuEsModel.setSkuTitle(title);
                }
                esModelList.add(skuEsModel);
            }
        }
        result.setProducts(esModelList);

        //=========================================

        //2、返回当前商品涉及到的所有属性信息
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        ArrayList<SearchResult.AttrVo> attrVos = new ArrayList<>();
        for (Terms.Bucket attr_aggBucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //得到属性id
            long attrId = attr_aggBucket.getKeyAsNumber().longValue();
            //得到属性名
            ParsedStringTerms attr_name_agg = attr_aggBucket.getAggregations().get("attr_name_agg");
            String attr_name = attr_name_agg.getBuckets().get(0).getKeyAsString();
            //得到属性值
            ParsedStringTerms attr_value_agg = attr_aggBucket.getAggregations().get("attr_value_agg");
            List<String> collect = attr_value_agg.getBuckets().stream().map(item -> item.getKeyAsString()).collect(Collectors.toList());

            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attr_name);
            attrVo.setAttrValue(collect);


            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);

        //3、返回当前商品涉及到的所有品牌信息
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        List<? extends Terms.Bucket> brand_aggBuckets = brand_agg.getBuckets();
        ArrayList<SearchResult.BrandVo> brandVos = new ArrayList<>();
        for (Terms.Bucket brand_aggBucket : brand_aggBuckets) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            //得到品牌id
            brandVo.setBrandId(brand_aggBucket.getKeyAsNumber().longValue());
            //得到品牌名字
            ParsedStringTerms brand_name_agg = brand_aggBucket.getAggregations().get("brand_name_agg");
            String brand_name = brand_name_agg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandName(brand_name);
            //得到品牌图片
            ParsedStringTerms brand_img_agg = brand_aggBucket.getAggregations().get("brand_img_agg");
            String brand_img = brand_img_agg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandImg(brand_img);

            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);
        //4、返回当前商品涉及到的所有分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //得到分类id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));
            //得到分类名字
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();

            catalogVo.setCatalogName(catalog_name);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);

        //=========================================

        //5、分页信息 - 页码、
        result.setPageNum(param.getPageNum());
        // 总记录数、
        long total = hits.getTotalHits().value;
        result.setTotal(total);
        // 总页码 计算：total/每页大小 = 11/2 = 5...1
        int totalPages = (int) total % EsConstant.PRODUCT_PAGE_SIZE == 0 ? (int) total / EsConstant.PRODUCT_PAGE_SIZE : (((int) total / EsConstant.PRODUCT_PAGE_SIZE) + 1);
        result.setTotalPages(totalPages);

        ArrayList<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);


        //6、构建面包屑导航功能
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            List<SearchResult.NavVo> navVos = param.getAttrs().stream().map(attr -> {
                //1、分析每个attrs传递过来的查询参数
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                // attr=2_5寸：6寸
                String[] s = attr.split("_");
                //s[1] : 5寸：6寸
                navVo.setNavValue(s[1]);
                //远程调用productFeignService
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                if (r.getCode() == 0) {
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {
                    });
                    navVo.setNavName(data.getAttrName());
                } else {
                    navVo.setNavName(s[0]);
                }
                //2、取消了这个面包屑以后，我们要跳转到哪个地方,将请求地址的url里面的内容制空
                //拿到所有的查询条件，去掉当前的
                String replace = replaceQueryString(param, attr,"attrs");
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);

                return navVo;
            }).collect(Collectors.toList());
            result.setNavs(navVos);
        }

        //品牌
        if (param.getBrandId() != null && param.getBrandId().size() > 0) {
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");
            //TODO 远程查询所有品牌
            R r = productFeignService.brandInfo(param.getBrandId());
            if (r.getCode() == 0) {
                List<BrandVo> brand = r.getData("brands", new TypeReference<List<BrandVo>>() {
                });
                StringBuffer buffer = new StringBuffer();
                String replace = "";
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getBrandName()+";");
                    replace = replaceQueryString(param,brandVo.getBrandId()+"","brandId");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);
            }

            navs.add(navVo);
        }


        return result;
    }

    private String replaceQueryString(SearchParam param, String value, String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            encode = encode.replace("+", "%20");//浏览器对空格编码和java的不一样
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return param.get_queryString().replace("&" + key + "=" + encode, "");
    }


    /**
     * 准备检索请求
     * #模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存)，排序，分页，高亮，聚合分析
     *
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam param) {
        //用于构建DSL语句
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

        //1、构建bool - query 进行查询
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();


        /**
         * 模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存)
         */
        //1.1  must   模糊匹配 skuTitle
        if (!StringUtils.isEmpty(param.getKeyword())) {
            boolQuery.must(QueryBuilders.matchQuery("skuTitle", param.getKeyword()));
        }

        //1.2.1 bool - filter - catalogId  按照三级分类id查询
        if (param.getCatalog3Id() != null) {
            boolQuery.filter(QueryBuilders.termQuery("catalogId", param.getCatalog3Id()));
        }

        //1.2.2 bool - filter - brandId 按照品牌id查询
        if (param.getBrandId() != null && param.getBrandId().size() > 0) {
            boolQuery.filter(QueryBuilders.termsQuery("brandId", param.getBrandId()));
        }

        //1.2.3 bool - filter - hasStock  按照是否有库存查询  有库存：true（1）   无库存：false（0）
        if (param.getHasStock() != null) {
            boolQuery.filter(QueryBuilders.termQuery("hasStock", param.getHasStock() == 1));
        }

        //1.2.4 bool - filter  按照所有指定的属性查询
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            for (String attr : param.getAttrs()) {
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
                //前端传来的参数格式   attrs=1_5寸：8存
                String[] s = attr.split("_");// 1   5寸：8存
                String attrId = s[0];//检索的属性id
                String[] attrValues = s[1].split(":");//检索的所有属性值
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId", attrId));
                /*System.out.println(attrId);
                System.out.println(Arrays.toString(attrValues));*/
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue", attrValues));
                //每一个属性都必须得生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }
        }

        //1.2.5 bool - filter - skuPrice  按照价格区间查询
        if (!StringUtils.isEmpty(param.getSkuPrice())) {
            //前端传来的参数格式   skuPrice=1_500/_500/500_
            /**
             * "range": {
             *             "skuPrice": {
             *               "gte": 0,
             *               "lte": 6000
             *             }
             *           }
             */
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            //根据  _  进行分割
            String[] s = param.getSkuPrice().split("_");
            if (s.length == 2) {// "1_500"
                //区间: 大于s[0]  小于s[1]
                rangeQuery.gte(s[0]).lte(s[1]);
            } else if (s.length == 1) {//  "_500"    "500_"
                if (param.getSkuPrice().startsWith("_")) {//以 "_" 开头的："_500"
                    //区间: 小于s[0]
                    rangeQuery.lte(s[1]);
                }
                if (param.getSkuPrice().endsWith("_")) {//以 "_" 结尾的："500_"
                    //区间: 大于s[0]
                    rangeQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rangeQuery);
        }

        //把以前得所有构建得条件都拿来封装
        sourceBuilder.query(boolQuery);

        /**
         * 排序，分页，高亮
         */

        //2.1、排序
        if (!StringUtils.isEmpty(param.getSort())) {
            //前端传来的参数格式  sort=saLeCount_asc/desc
            String sort = param.getSort();
            String[] s = sort.split("_");
            // equalsIgnoreCase 作用一般是用来比较字母的长度和字符是否相同，切不区分大小写
            SortOrder sortOrder = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(s[0], sortOrder);
        }

        //2.2、分页
        //from：从第几条记录开始    计算： （pageNum - 1） * pageSize
        sourceBuilder.from((param.getPageNum() - 1) * EsConstant.PRODUCT_PAGE_SIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGE_SIZE);

        //2.3、高亮
        if (!StringUtils.isEmpty(param.getKeyword())) {
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle").preTags(EsConstant.PRODUCT_PRE_TAGS).postTags(EsConstant.PRODUCT_POST_TAGS);
            sourceBuilder.highlighter(builder);
        }

        /**
         * 聚合分析
         */
        //3.1、品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        TermsAggregationBuilder brandId = brand_agg.field("brandId");
        brandId.size(50);
        //3.1.1、品牌聚合的子聚合 - 品牌名聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        //3.1.2、品牌聚合的子聚合 - 品牌图片logo聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        //TODO 品牌聚合 brand
        sourceBuilder.aggregation(brand_agg);

        //3.2、分类聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg");
        catalog_agg.field("catalogId").size(50);
        //3.2.1、分类聚合的子聚合 - 分类名聚合
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        //TODO 分类聚合 catalog
        sourceBuilder.aggregation(catalog_agg);
        //3.3、属性嵌入聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        //3.3.1、属性聚合的子聚合 - 分类id聚合
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId").size(50);
        //3.3.1.1、分类id的子聚合 - 分类名聚合
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        //3.3.1.2、分类id的子聚合 - 分类名对应的值的聚合
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        //设置上attr_agg 的 全部子聚合
        attr_agg.subAggregation(attr_id_agg);
        //TODO 属性聚合 attr
        sourceBuilder.aggregation(attr_agg);

        System.out.println(sourceBuilder.toString());

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);


        return searchRequest;
    }


    /**
     * 准备检索请求
     * 模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存），排序，分页，高亮，聚合分析
     *
     * @return
     */
    private SearchRequest buildSearchRequests(SearchParam param) {

        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

        /**
         * 模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存）
         */
        //1. 构建bool-query
        BoolQueryBuilder boolQueryBuilder = new BoolQueryBuilder();

        //1.1 bool-must
        if (!StringUtils.isEmpty(param.getKeyword())) {
            boolQueryBuilder.must(QueryBuilders.matchQuery("skuTitle", param.getKeyword()));
        }

        //1.2 bool-fiter
        //1.2.1 catelogId
        if (null != param.getCatalog3Id()) {
            boolQueryBuilder.filter(QueryBuilders.termQuery("catalogId", param.getCatalog3Id()));
        }

        //1.2.2 brandId
        if (null != param.getBrandId() && param.getBrandId().size() > 0) {
            boolQueryBuilder.filter(QueryBuilders.termsQuery("brandId", param.getBrandId()));
        }

        //1.2.3 attrs
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {

            param.getAttrs().forEach(item -> {
                //attrs=1_5寸:8寸&2_16G:8G
                BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();


                //attrs=1_5寸:8寸
                String[] s = item.split("_");
                String attrId = s[0];
                String[] attrValues = s[1].split(":");//这个属性检索用的值
                boolQuery.must(QueryBuilders.termQuery("attrs.attrId", attrId));
                boolQuery.must(QueryBuilders.termsQuery("attrs.attrValue", attrValues));

                NestedQueryBuilder nestedQueryBuilder = QueryBuilders.nestedQuery("attrs", boolQuery, ScoreMode.None);
                boolQueryBuilder.filter(nestedQueryBuilder);
            });

        }

        //1.2.4 hasStock
        if (null != param.getHasStock()) {
            boolQueryBuilder.filter(QueryBuilders.termQuery("hasStock", param.getHasStock() == 1));
        }


        //1.2.5 skuPrice
        if (!StringUtils.isEmpty(param.getSkuPrice())) {
            //skuPrice形式为：1_500或_500或500_
            RangeQueryBuilder rangeQueryBuilder = QueryBuilders.rangeQuery("skuPrice");
            String[] price = param.getSkuPrice().split("_");
            if (price.length == 2) {
                rangeQueryBuilder.gte(price[0]).lte(price[1]);
            } else if (price.length == 1) {
                if (param.getSkuPrice().startsWith("_")) {
                    rangeQueryBuilder.lte(price[1]);
                }
                if (param.getSkuPrice().endsWith("_")) {
                    rangeQueryBuilder.gte(price[0]);
                }
            }
            boolQueryBuilder.filter(rangeQueryBuilder);
        }

        //封装所有的查询条件
        searchSourceBuilder.query(boolQueryBuilder);


        /**
         * 排序，分页，高亮
         */

        //排序
        //形式为sort=hotScore_asc/desc
        if (!StringUtils.isEmpty(param.getSort())) {
            String sort = param.getSort();
            String[] sortFileds = sort.split("_");

            SortOrder sortOrder = "asc".equalsIgnoreCase(sortFileds[1]) ? SortOrder.ASC : SortOrder.DESC;

            searchSourceBuilder.sort(sortFileds[0], sortOrder);
        }

        //分页
        searchSourceBuilder.from((param.getPageNum() - 1) * EsConstant.PRODUCT_PAGE_SIZE);
        searchSourceBuilder.size(EsConstant.PRODUCT_PAGE_SIZE);

        //高亮
        if (!StringUtils.isEmpty(param.getKeyword())) {

            HighlightBuilder highlightBuilder = new HighlightBuilder();
            highlightBuilder.field("skuTitle");
            highlightBuilder.preTags("<b style='color:red'>");
            highlightBuilder.postTags("</b>");

            searchSourceBuilder.highlighter(highlightBuilder);
        }


        /**
         * 聚合分析
         */
        //1. 按照品牌进行聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);


        //1.1 品牌的子聚合-品牌名聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg")
                .field("brandName").size(1));
        //1.2 品牌的子聚合-品牌图片聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg")
                .field("brandImg").size(1));

        searchSourceBuilder.aggregation(brand_agg);

        //2. 按照分类信息进行聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg");
        catalog_agg.field("catalogId").size(20);

        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));

        searchSourceBuilder.aggregation(catalog_agg);

        //2. 按照属性信息进行聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        //2.1 按照属性ID进行聚合
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        attr_agg.subAggregation(attr_id_agg);
        //2.1.1 在每个属性ID下，按照属性名进行聚合
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        //2.1.1 在每个属性ID下，按照属性值进行聚合
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        searchSourceBuilder.aggregation(attr_agg);

        log.info("构建的DSL语句 {}", searchSourceBuilder.toString());

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, searchSourceBuilder);

        return searchRequest;
    }


}
